To create a volcano, flatten any piece of land then raise it with the largest type of raising tool. Then, in the middle, use the smallest raising tool to put the middle all the way down to the water.

Dart flying

Find a dart anywhere in any level. Next, find the highest rocky mountain that you cannot climb up. Take your dart up that mountain/slope. Before you go up, look all the way up and keep looking in that direction. When you get to the top of the mountain, keep holding Forward and looking up. The dart will move into the sky. Do not release it yet. Keep going into the sky. You will fall off, but keep looking up all the way and watch the dart. It will fly quickly into the sky and disappear. Note: This glitch will not allow you to stay flying. Also, this works best with custom maps.